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Berikut Sedikit Menjelaskan Kenapa Kebanyakan Lampu Sorot Berwarna Kuning, Ini Adalah
karena Efek Tyndall.
Berikut Sedikit Menjelaskan Kenapa
Kebanyakan Lampu Sorot Berwarna Kuning, Ini Adalah karena Efek Tyndall.
Penampilan system koloid pada umumnya keruh, tetapi tidak selalu begitu.
Beberapa ‘larutan’ koloid tampak “bening” dan sukar dibedakan dengan
larutan sejati. Bagaimanakah cara mengenali system koloid? Salah satu cara yang sangat sederhana
yaitu dengan menjatuhkan seberkas cahayakepadanya. Larutan sejati meneruskan cahaya (transparan),
sedangkan koloid menghamburkannya. Oleh karena itu, berkas cahaya yang melalui koloid dapat di
amati dari arah samping. Efek Tyndall ini ditemukan oleh John Tyndall (1820-1893), seorang ahli
fisika Inggris. Oleh karena itu sifat itu disebut efek Tyndall.
Efek Tyndall adalah adanya gejala penghamburan berkas cahaya oleh
partikel-partikel koloid. Apabila seberkas cahaya dijatuhkan ke dalam sistem koloid, maka cahaya
akan dihamburkan. Apabila seberkas cahaya dijatuhkan ke dalam sistem larutan, maka cahaya akan
Dalam Kehidupan sehari-hari, kita sering
mengamati efek Tyndall ini, antara lain:
sorot lampu pada malam yang berkabut
sorot lampu proyektor dalam gedung bioskop yang berasap /berdebu, dan
berkas sinar matahari melalui celah
daun pohon pada pagi hari yang berkabut.
Efek Tyndall tidak
sama untuk setiap sinar yang mempunyai panjang gelombang berbeda. Sinar kuning, misalnya, lebih
sedikit dihamburkan. Itulah sebabnya lampu warna kuning dipakai pada saat berkabut, di mana
cahaya kuning dapat menembus kabut dan terlihat oleh pemakai jalan.
Inilah kenapa kebanyakan lampu sorot berwarna kuning senja.
'Si Doel Anak Sekolahan' Dimanpaatkan Dirjen Pajak Tarik pajak
Saco-Indonesia.com - Direktorat Jenderal Pajak Kementerian Keuangan memanfaatkan Wakil Gubernur Banten Rano "Doel" Karno untuk meningkatkan kepatuhan warga di wilayah yang terkenal dengan debus itu.
Saco-Indonesia.com - Direktorat Jenderal Pajak Kementerian Keuangan memanfaatkan Wakil Gubernur Banten Rano "Doel" Karno untuk meningkatkan kepatuhan warga di wilayah yang terkenal dengan debus itu. Dari 4,6 juta warga Banten yang bekerja, baru 73 ribu yang tercatat menjadi wajib pajak, hanya meningkat 0,15 persen dari tahun sebelumnya.
"Jumlah wajib pajak Banten belum mencerminkan, artinya masih perlu digali," ujar Kepala Kanwil Ditjen Pajak Banten Muhammad Hanif saat memberikan sambutan pada e-filling SPT Tahunan PPh orang pribadi tahun pajak 2013, Banten, Selasa (18/3).
Dia berharap langkah Rano Karno dalam menyampaikan SPT 2013 bisa diikuti oleh warga Banten lainnya. terlebih lagi, penyampaian SPT secara online atau e-Filling membuat wajib pajak tidak perlu repot-repot mendatangi kantor pajak.
"Pejabat menjadi contoh panutan yang baik bagi masyarakat Serang dan Banten khususnya, agar tergugah untuk membayar pajak," jelasnya.
Hanif menguraikan realisasi penerimaan pajak di Banten tahun lalu sebesar Rp 21,2 Triliun atau melebihi target Rp 21,1 triliun. Dari 1,29 juta wajib pajak, baru 573.273 wajib pajak yang menyampaikan SPT tahunan 2013.
"Kalau nasional menargetkan harus 70 persen, di Banten masih 56,7 persen WP Orang Pribadi yang menyampaikan SPT. Ini masih rendah," ungkapnya.
Hanif mengaku jumlah wajib pajak yang sudah menggunakan e-Filling sebesar 113.759 orang. Sedangkan pendaftar e-filling sebanyak 44.000 wajib pajak.
"Ditargetkan 44.000, kita sudah mencapai 19,5 ribu, insya allah sampai akhir maret tercapai," tegasnya.
Editor : Maulana Lee
Sumber : merdeka.com
Rhapsody, a Lofty Literary Journal, Perused at 39,000 Feet
Last summer at a writers’ workshop in Oregon, the novelists Anthony Doerr, Karen Russell and Elissa Schappell were chatting over cocktails when they realized they had all published work in the same magazine. It wasn’t one of the usual literary outlets, like Tin House, The Paris Review or The New Yorker. It was Rhapsody, an in-flight magazine for United Airlines.
It seemed like a weird coincidence. Then again, considering Rhapsody’s growing roster of A-list fiction writers, maybe not. Since its first issue hit plane cabins a year and a half ago, Rhapsody has published original works by literary stars like Joyce Carol Oates, Rick Moody, Amy Bloom, Emma Straub and Mr. Doerr, who won the Pulitzer Prize for fiction two weeks ago.
As airlines try to distinguish their high-end service with luxuries like private sleeping chambers, showers, butler service and meals from five-star chefs, United Airlines is offering a loftier, more cerebral amenity to its first-class and business-class passengers: elegant prose by prominent novelists. There are no airport maps or disheartening lists of in-flight meal and entertainment options in Rhapsody. Instead, the magazine has published ruminative first-person travel accounts, cultural dispatches and probing essays about flight by more than 30 literary fiction writers.
An airline might seem like an odd literary patron. But as publishers and writers look for new ways to reach readers in a shaky retail climate, many have formed corporate alliances with transit companies, including American Airlines, JetBlue and Amtrak, that provide a captive audience.
Mark Krolick, United Airlines’ managing director of marketing and product development, said the quality of the writing in Rhapsody brings a patina of sophistication to its first-class service, along with other opulent touches like mood lighting, soft music and a branded scent.
“The high-end leisure or business-class traveler has higher expectations, even in the entertainment we provide,” he said.
Some of Rhapsody’s contributing writers say they were lured by the promise of free airfare and luxury accommodations provided by United, as well as exposure to an elite audience of some two million first-class and business-class travelers.
“It’s not your normal Park Slope Community Bookstore types who read Rhapsody,” Mr. Moody, author of the 1994 novel “The Ice Storm,” who wrote an introspective, philosophical piece about traveling to the Aran Islands of Ireland for Rhapsody, said in an email. “I’m not sure I myself am in that Rhapsody demographic, but I would like them to buy my books one day.”
In addition to offering travel perks, the magazine pays well and gives writers freedom, within reason, to choose their subject matter and write with style. Certain genres of flight stories are off limits, naturally: no plane crashes or woeful tales of lost luggage or rude flight attendants, and nothing too risqué.
“We’re not going to have someone write about joining the mile-high club,” said Jordan Heller, the editor in chief of Rhapsody. “Despite those restrictions, we’ve managed to come up with a lot of high-minded literary content.”
Guiding writers toward the right idea occasionally requires some gentle prodding. When Rhapsody’s executive editor asked Ms. Russell to contribute an essay about a memorable flight experience, she first pitched a story about the time she was chaperoning a group of teenagers on a trip to Europe, and their delayed plane sat at the airport in New York for several hours while other passengers got progressively drunker.
“He pointed out that disaster flights are not what people want to read about when they’re in transit, and very diplomatically suggested that maybe people want to read something that casts air travel in a more positive light,” said Ms. Russell, whose novel “Swamplandia!” was a finalist for the 2012 Pulitzer Prize.
She turned in a nostalgia-tinged essay about her first flight on a trip to Disney World when she was 6. “The Magic Kingdom was an anticlimax,” she wrote. “What ride could compare to that first flight?”
Ms. Oates also wrote about her first flight, in a tiny yellow propeller plane piloted by her father. The novelist Joyce Maynard told of the constant disappointment of never seeing her books in airport bookstores and the thrill of finally spotting a fellow plane passenger reading her novel “Labor Day.” Emily St. John Mandel, who was a finalist for the National Book Award in fiction last year, wrote about agonizing over which books to bring on a long flight.
“There’s nobody that’s looked down their noses at us as an in-flight magazine,” said Sean Manning, the magazine’s executive editor. “As big as these people are in the literary world, there’s still this untapped audience for them of luxury travelers.”
United is one of a handful of companies showcasing work by literary writers as a way to elevate their brands and engage customers. Chipotle has printed original work from writers like Toni Morrison, Jeffrey Eugenides and Barbara Kingsolver on its disposable cups and paper bags. The eyeglass company Warby Parker hosts parties for authors and sells books from 14 independent publishers in its stores.
JetBlue offers around 40 e-books from HarperCollins and Penguin Random House on its free wireless network, allowing passengers to read free samples and buy and download books. JetBlue will start offering 11 digital titles from Simon & Schuster soon. Amtrak recently forged an alliance with Penguin Random House to provide free digital samples from 28 popular titles, which passengers can buy and download over Amtrak’s admittedly spotty wireless service.
Amtrak is becoming an incubator for literary talent in its own right. Last year, it started a residency program, offering writers a free long-distance train trip and complimentary food. More than 16,000 writers applied and 24 made the cut.
Like Amtrak, Rhapsody has found that writers are eager to get onboard. On a rainy spring afternoon, Rhapsody’s editorial staff sat around a conference table discussing the June issue, which will feature an essay by the novelist Hannah Pittard and an unpublished short story by the late Elmore Leonard.
“Do you have that photo of Elmore Leonard? Can I see it?” Mr. Heller, the editor in chief, asked Rhapsody’s design director, Christos Hannides. Mr. Hannides slid it across the table and noted that they also had a photograph of cowboy spurs. “It’s very simple; it won’t take away from the literature,” he said.
Rhapsody’s office, an open space with exposed pipes and a vaulted brick ceiling, sits in Dumbo at the epicenter of literary Brooklyn, in the same converted tea warehouse as the literary journal N+1 and the digital publisher Atavist. Two of the magazine’s seven staff members hold graduate degrees in creative writing. Mr. Manning, the executive editor, has published a memoir and edited five literary anthologies.
Mr. Manning said Rhapsody was conceived from the start as a place for literary novelists to write with voice and style, and nobody had been put off that their work would live in plane cabins and airport lounges.
Still, some contributors say they wish the magazine were more widely circulated.
“I would love it if I could read it,” said Ms. Schappell, a Brooklyn-based novelist who wrote a feature story for Rhapsody’s inaugural issue. “But I never fly first class.”
But an unusual assortment of players, including furniture makers, the Chinese government, Republicans from states with a large base of furniture manufacturing and even some Democrats who championed early regulatory efforts, have questioned the E.P.A. proposal. The sustained opposition has held sway, as the agency is now preparing to ease key testing requirements before it releases the landmark federal health standard.
The E.P.A.’s five-year effort to adopt this rule offers another example of how industry opposition can delay and hamper attempts by the federal government to issue regulations, even to control substances known to be harmful to human health.
Formaldehyde is a known carcinogen that can also cause respiratory ailments like asthma, but the potential of long-term exposure to cause cancers like myeloid leukemia is less well understood.
The E.P.A.’s decision would be the first time that the federal government has regulated formaldehyde inside most American homes.
“The stakes are high for public health,” said Tom Neltner, senior adviser for regulatory affairs at the National Center for Healthy Housing, who has closely monitored the debate over the rules. “What we can’t have here is an outcome that fails to confront the health threat we all know exists.”
The proposal would not ban formaldehyde — commonly used as an ingredient in wood glue in furniture and flooring — but it would impose rules that prevent dangerous levels of the chemical’s vapors from those products, and would set testing standards to ensure that products sold in the United States comply with those limits. The debate has sharpened in the face of growing concern about the safety of formaldehyde-treated flooring imported from Asia, especially China.
What is certain is that a lot of money is at stake: American companies sell billions of dollars’ worth of wood products each year that contain formaldehyde, and some argue that the proposed regulation would impose unfair costs and restrictions.
Determined to block the agency’s rule as proposed, these industry players have turned to the White House, members of Congress and top E.P.A. officials, pressing them to roll back the testing requirements in particular, calling them redundant and too expensive.
“There are potentially over a million manufacturing jobs that will be impacted if the proposed rule is finalized without changes,” wrote Bill Perdue, the chief lobbyist at the American Home Furnishings Alliance, a leading critic of the testing requirements in the proposed regulation, in one letter to the E.P.A.
Industry opposition helped create an odd alignment of forces working to thwart the rule. The White House moved to strike out key aspects of the proposal. Subsequent appeals for more changes were voiced by players as varied as Senator Barbara Boxer, Democrat of California, and Senator Roger Wicker, Republican of Mississippi, as well as furniture industry lobbyists.
Hurricane Katrina in 2005 helped ignite the public debate over formaldehyde, after the deadly storm destroyed or damaged hundreds of thousands of homes along the Gulf of Mexico, forcing families into temporary trailers provided by the Federal Emergency Management Agency.
The displaced storm victims quickly began reporting respiratory problems, burning eyes and other issues, and tests then confirmed high levels of formaldehyde fumes leaking into the air inside the trailers, which in many cases had been hastily constructed.
Public health advocates petitioned the E.P.A. to issue limits on formaldehyde in building materials and furniture used in homes, given that limits already existed for exposure in workplaces. But three years after the storm, only California had issued such limits.
Industry groups like the American Chemistry Council have repeatedly challenged the science linking formaldehyde to cancer, a position championed by David Vitter, the Republican senator from Louisiana, who is a major recipient of chemical industry campaign contributions, and whom environmental groups have mockingly nicknamed “Senator Formaldehyde.”
By 2010, public health advocates and some industry groups secured bipartisan support in Congress for legislation that ordered the E.P.A. to issue federal rules that largely mirrored California’s restrictions. At the time, concerns were rising over the growing number of lower-priced furniture imports from Asia that might include contaminated products, while also hurting sales of American-made products.
Maneuvering began almost immediately after the E.P.A. prepared draft rules to formally enact the new standards.
White House records show at least five meetings in mid-2012 with industry executives — kitchen cabinet makers, chemical manufacturers, furniture trade associations and their lobbyists, like Brock R. Landry, of the Venable law firm. These parties, along with Senator Vitter’s office, appealed to top administration officials, asking them to intervene to roll back the E.P.A. proposal.
The White House Office of Management and Budget, which reviews major federal regulations before they are adopted, apparently agreed. After the White House review, the E.P.A. “redlined” many of the estimates of the monetary benefits that would be gained by reductions in related health ailments, like asthma and fertility issues, documents reviewed by The New York Times show.
As a result, the estimated benefit of the proposed rule dropped to $48 million a year, from as much as $278 million a year. The much-reduced amount deeply weakened the agency’s justification for the sometimes costly new testing that would be required under the new rules, a federal official involved in the effort said.
“It’s a redlining blood bath,” said Lisa Heinzerling, a Georgetown University Law School professor and a former E.P.A. official, using the Washington phrase to describe when language is stricken from a proposed rule. “Almost the entire discussion of these potential benefits was excised.”
“That’s a huge difference,” said Luke Bolar, a spokesman for Mr. Vitter, of the reduced estimated financial benefits, saying the change was “clearly highlighting more mismanagement” at the E.P.A.
The review’s outcome galvanized opponents in the furniture industry. They then targeted a provision that mandated new testing of laminated wood, a cheaper alternative to hardwood. (The California standard on which the law was based did not require such testing.)
But E.P.A. scientists had concluded that these laminate products — millions of which are sold annually in the United States — posed a particular risk. They said that when thin layers of wood, also known as laminate or veneer, are added to furniture or flooring in the final stages of manufacturing, the resulting product can generate dangerous levels of fumes from often-used formaldehyde-based glues.
Industry executives, outraged by what they considered an unnecessary and financially burdensome level of testing, turned every lever within reach to get the requirement removed. It would be particularly onerous, they argued, for small manufacturers that would have to repeatedly interrupt their work to do expensive new testing. The E.P.A. estimated that the expanded requirements for laminate products would cost the furniture industry tens of millions of dollars annually, while the industry said that the proposed rule over all would cost its 7,000 American manufacturing facilities over $200 million each year.
“A lot of people don’t seem to appreciate what a lot of these requirements do to a small operation,” said Dick Titus, executive vice president of the Kitchen Cabinet Manufacturers Association, whose members are predominantly small businesses. “A 10-person shop, for example, just really isn’t equipped to handle that type of thing.”
Big industry players also weighed in. Executives from companies including La-Z-Boy, Hooker Furniture and Ashley Furniture all flew to Washington for a series of meetings with the offices of lawmakers including House Speaker John Boehner, Republican of Ohio, and about a dozen other lawmakers, asking several of them to sign a letter prepared by the industry to press the E.P.A. to back down, according to an industry report describing the lobbying visit.
The industry lobbyists also held their own meeting at E.P.A. headquarters, and they urged Jim Jones, who oversaw the rule-making process as the assistant administrator for the agency’s Office of Chemical Safety and Pollution Prevention, to visit a North Carolina furniture manufacturing plant. According to the trade group, Mr. Jones told them that the visit had “helped the agency shift its thinking” about the rules and how laminated products should be treated.
The resistance was particularly intense from lawmakers like Mr. Wicker of Mississippi, whose state is home to major manufacturing plants owned by Ashley Furniture Industries, the world’s largest furniture maker, and who is one of the biggest recipients in Congress of donations from the industry’s trade association. Asked if the political support played a role, a spokesman for Mr. Wicker replied: “Thousands of Mississippians depend on the furniture manufacturing industry for their livelihoods. Senator Wicker is committed to defending all Mississippians from government overreach.”
Individual companies like Ikea also intervened, as did the Chinese government, which claimed that the new rule would create a “great barrier” to the import of Chinese products because of higher costs.
Perhaps the most surprising objection came from Senator Boxer, of California, a longtime environmental advocate, whose office questioned why the E.P.A.’s rule went further than her home state’s in seeking testing on laminated products. “We did not advocate an outcome, other than safety,” her office said in a statement about why the senator raised concerns. “We said ‘Take a look to see if you have it right.’ ”
Safety advocates say that tighter restrictions — like the ones Ms. Boxer and Mr. Wicker, along with Representative Doris Matsui, a California Democrat, have questioned — are necessary, particularly for products coming from China, where items as varied as toys and Christmas lights have been found to violate American safety standards.
While Mr. Neltner, the environmental advocate who has been most involved in the review process, has been open to compromise, he has pressed the E.P.A. not to back down entirely, and to maintain a requirement that laminators verify that their products are safe.
An episode of CBS’s “60 Minutes” in March brought attention to the issue when it accused Lumber Liquidators, the discount flooring retailer, of selling laminate products with dangerous levels of formaldehyde. The company has disputed the show’s findings and test methods, maintaining that its products are safe.
“People think that just because Congress passed the legislation five years ago, the problem has been fixed,” said Becky Gillette, who then lived in coastal Mississippi, in the area hit by Hurricane Katrina, and was among the first to notice a pattern of complaints from people living in the trailers. “Real people’s faces and names come up in front of me when I think of the thousands of people who could get sick if this rule is not done right.”
An aide to Ms. Matsui rejected any suggestion that she was bending to industry pressure.
“From the beginning the public health has been our No. 1 concern,” said Kyle J. Victor, an aide to Ms. Matsui.
But further changes to the rule are likely, agency officials concede, as they say they are searching for a way to reduce the cost of complying with any final rule while maintaining public health goals. The question is just how radically the agency will revamp the testing requirement for laminated products — if it keeps it at all.
“It’s not a secret to anybody that is the most challenging issue,” said Mr. Jones, the E.P.A. official overseeing the process, adding that the health consequences from formaldehyde are real. “We have to reduce those exposures so that people can live healthy lives and not have to worry about being in their homes.”